Abstract
Background
Inorganic arsenic [As(III)] and hexavalent chromium [Cr(VI)] can potentially affect metabolic functions. These heavy metal(s)/metalloids can also affect the gut microbial architecture which affects metabolic health. Here, we assessed the effects of short-term exposure of As(III) and Cr(VI) on key transcription factors in adipose tissues and on selected gut microbial abundances to understand the possible modulatory role of these toxicants on host metabolic health.
Methods and results
qRT-PCR based relative bacterial abundance studies in cecal samples, gene expression analysis for gut wall integrity in ileum and colon and adipogenesis, lipolysis, and thermogenic genes in gonadal white and brown adipose tissue (gWAT and BAT), along with tissue oxidative stress parameters have been performed. As(III) and Cr(VI) exposure reduced beneficial Lactobacilli, Bifidobacteria, Akkermansia, Lachenospiraceae, Fecalibacterium, Eubacterium, and clostridium coccoid group while increasing lipopolysaccharides producing Enterobacteriaceae abundances. It also impaired structural features and expression of key tight junction and mucin production genes in ileum and colon (Cld-2, Cld-4, ZO-1, ZO-2, MUC-2 and − 4). In gWAT it inhibited adipogenesis (PPARγ, FASN, SREBP1a), lipolysis (HSL, ACOX-1), and thermogenesis (UCP-1, PGC1a, PRDM-16, PPARa) related genes expression, whereas in BAT, it enhanced adipogenesis and reduced thermogenesis. These exposures also reduces the endogenous antioxidants levels in these tissues and promote pro-inflammatory cytokines genes expression (TLRs, IL-6, MCP-1). The combinatorial exposure appears to have more deleterious effects.
Conclusion
These effects of As(III) and Cr(VI) may not directly be linked to their known toxicological effects, instead, more intriguing crosstalk with gut microbial ecosystem hold the key.
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Data availability
All the research data and available materials requests can be sent to the corresponding author. Data and materials would be available on reasonable requests.
Abbreviations
- ACC:
-
Acetyl-CoA carboxylase
- ACOX-1:
-
Acyl-CoA Oxidase 1
- AKK:
-
Akkermansia sp.
- ANERO:
-
Anaerostipes sp.
- As(III):
-
Inorganic arsenic
- BACT:
-
Bacteroidetes
- BACT sp:
-
Bacteroides sp.
- BAT:
-
Brown adipose tissue
- BCA:
-
Bicinchoninic acid
- BIF:
-
Bifidobacteria
- BPULL:
-
Butyricicoccus pullicaecorum
- BVIB:
-
Butyrivibrio sp.
- CEBPa:
-
CCAAT/enhancer-binding protein alpha
- CITRO:
-
Citrobacter sp.
- Cld:
-
Claudin
- CLEP:
-
Clostridium sp.
- CPCSEA:
-
Committee for the purpose of control and supervision of experiments on animals
- CPROP:
-
Clostridium propionicum
- Cr(VI):
-
Hexavalent chromium
- CRONO:
-
Cronobacter sp.
- DIO2:
-
Type II iodothyronine deiodinase
- ECOL:
-
Escherichia coli
- ENT:
-
Enterobacter sp.
- ENTB:
-
Enterobacteriaceae
- EUBACT:
-
Eubacterium sp.
- F4/80:
-
EGF-like module-containing mucin-like hormone receptor-like 1
- FASN:
-
Fatty acid synthase
- FEC:
-
Fecalibacterium sp.
- FFAR:
-
Free fatty acid receptors
- FIRM:
-
Firmicutes
- gCCOC:
-
Clostridium coccoides group
- GK:
-
Glucokinase
- GLP-1:
-
Glucagon like peptide-1
- GST:
-
Glutathione-S-Transferase
- gWAT:
-
Gonadal white adipose tissue
- HSL:
-
Hormone-sensitive lipase
- IAEC:
-
Institutional Animal Ethics Committee
- ICMR:
-
Indian Council of Medical Research
- IL-6:
-
Interleukin-6
- iNOS:
-
Inducible nitric oxide synthase
- LAB:
-
Lactobacilli
- LACH:
-
Lachnospiraceae
- Lep:
-
Leptin
- LepR:
-
Leptin receptor
- MCP-1:
-
Macrophage chemoattractant protein-1
- MDA:
-
Malondialdehyde
- MUC:
-
Mucin
- MyD88:
-
Myeloid differentiation primary response 88
- NF-kB:
-
Nuclear factor-kappa beta
- PEPCK:
-
Phosphoenolpyruvate carboxykinase
- PGC1α:
-
Peroxisome proliferator-activated receptor-gamma coactivator 1 alpha
- PLIN-1:
-
Perilipin-1
- PPAR (α or γ):
-
Peroxisome proliferator-activated receptor (alpha or gamma)
- PRDM16:
-
PR domain containing 16
- PREVO:
-
Prevotella sp.
- ROS:
-
Roseburia sp.
- SALM:
-
Salmonella sp.
- SOD:
-
Superoxide dismutase
- SREBP1a:
-
Sterol regulatory element-binding protein 1
- TLR:
-
Toll-like receptor
- UCP-1:
-
Uncoupling protein-1
- ZO:
-
Zona occluding
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Acknowledgements
Authors would like to acknowledge the support of the Director, ICMR-NIOH for the infrastructural and institutional facilities.
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No separate funding was available to declare for this study. Funders have no role in study design, data analysis, and the decision to submit it for publication.
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DPS: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigations, Methodology, Project administration, Supervision, Visualizations, Writing-original draft, Review, and editing; SKY: Investigations, Writing-original draft; KP: Investigations, Writing-original draft; SP: Investigations, Writing-original draft; VB: Data curation, Visualization, writing original draft, review, and editing; GPP: Investigations, GS: Resources; RP: Resources, KKK: Conceptualization, Methodology; RKB: Data curation, writing original draft; MB: Methodology, Writing-original draft, Review, and editing; SD: Conceptualization, review and editing.
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Suitable ethical clearances (IAEC/NIOH/2020-21/23/# 8) were obtained for the use of tissue samples at the terminal time point from the institutional animal ethics committee of the ICMR-NIOH, Ahmedabad.
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Singh, D.P., Yadav, S.K., Patel, K. et al. Short-term trivalent arsenic and hexavalent chromium exposures induce gut dysbiosis and transcriptional alteration in adipose tissue of mice. Mol Biol Rep 50, 1033–1044 (2023). https://doi.org/10.1007/s11033-022-07992-z
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DOI: https://doi.org/10.1007/s11033-022-07992-z